/[svn]/libgig/trunk/src/gig.h

Diff of /libgig/trunk/src/gig.h

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-revision 773 by persson,
Sat Sep 17 14:24:45 2005 UTC
+revision 1335 by schoenebeck,
Sun Sep  9 21:22:58 2007 UTC
 Line 1
  /***************************************************************************
   *                                                                         *
-  *   libgig - C++ cross-platform Gigasampler format file loader library    *
+  *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2005 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2007 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 26
  #include "DLS.h"
- #include <math.h>
- #include <string.h>
- /// Initial size of the sample buffer which is used for decompression of
- /// compressed sample wave streams - this value should always be bigger than
- /// the biggest sample piece expected to be read by the sampler engine,
- /// otherwise the buffer size will be raised at runtime and thus the buffer
- /// reallocated which is time consuming and unefficient.
- #define INITIAL_SAMPLE_BUFFER_SIZE              512000 // 512 kB
  #if WORDS_BIGENDIAN
  # define LIST_TYPE_3PRG 0x33707267
  # define LIST_TYPE_3EWL 0x3365776C
+ # define LIST_TYPE_3GRI 0x33677269
+ # define LIST_TYPE_3GNL 0x33676E6C
  # define CHUNK_ID_SMPL  0x736D706C
  # define CHUNK_ID_3GIX  0x33676978
  # define CHUNK_ID_3EWA  0x33657761
  # define CHUNK_ID_3LNK  0x336C6E6B
  # define CHUNK_ID_3EWG  0x33657767
  # define CHUNK_ID_EWAV  0x65776176
+ # define CHUNK_ID_3GNM  0x33676E6D
+ # define CHUNK_ID_EINF  0x65696E66
+ # define CHUNK_ID_3CRC  0x33637263
  #else  // little endian
  # define LIST_TYPE_3PRG 0x67727033
  # define LIST_TYPE_3EWL 0x6C776533
+ # define LIST_TYPE_3GRI 0x69726733
+ # define LIST_TYPE_3GNL 0x6C6E6733
  # define CHUNK_ID_SMPL  0x6C706D73
  # define CHUNK_ID_3GIX  0x78696733
  # define CHUNK_ID_3EWA  0x61776533
  # define CHUNK_ID_3LNK  0x6B6E6C33
  # define CHUNK_ID_3EWG  0x67776533
  # define CHUNK_ID_EWAV  0x76617765
+ # define CHUNK_ID_3GNM  0x6D6E6733
+ # define CHUNK_ID_EINF  0x666E6965
+ # define CHUNK_ID_3CRC  0x63726333
  #endif // WORDS_BIGENDIAN
- /** (so far) every exponential paramater in the gig format has a basis of 1.000000008813822 */
- #define GIG_EXP_DECODE(x)                                       (pow(1.000000008813822, x))
- #define GIG_PITCH_TRACK_EXTRACT(x)                              (!(x & 0x01))
- #define GIG_VCF_RESONANCE_CTRL_EXTRACT(x)                       ((x >> 4) & 0x03)
- #define GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(x)                  ((x >> 1) & 0x03)
- #define GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(x)                   ((x >> 3) & 0x03)
- #define GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(x)                 ((x >> 5) & 0x03)
  /** Gigasampler specific classes and definitions */
  namespace gig {
-Line 148 
 namespace gig {
+Line 140 
 namespace gig {
      /** Defines how the filter cutoff frequency is controlled by. */
      typedef enum {
          vcf_cutoff_ctrl_none         = 0x00,
-         vcf_cutoff_ctrl_none2        = 0x01,  ///< The difference betwheen none and none2 is unknown
+         vcf_cutoff_ctrl_none2        = 0x01,  ///< The difference between none and none2 is unknown
          vcf_cutoff_ctrl_modwheel     = 0x81,  ///< Modulation Wheel (MIDI Controller 1)
          vcf_cutoff_ctrl_effect1      = 0x8c,  ///< Effect Controller 1 (Coarse, MIDI Controller 12)
          vcf_cutoff_ctrl_effect2      = 0x8d,  ///< Effect Controller 2 (Coarse, MIDI Controller 13)
-Line 222 
 namespace gig {
+Line 214 
 namespace gig {
          dimension_none              = 0x00, ///< Dimension not in use.
          dimension_samplechannel     = 0x80, ///< If used sample has more than one channel (thus is not mono).
          dimension_layer             = 0x81, ///< For layering of up to 8 instruments (and eventually crossfading of 2 or 4 layers).
-         dimension_velocity          = 0x82, ///< Key Velocity (this is the only dimension where the ranges can exactly be defined).
+         dimension_velocity          = 0x82, ///< Key Velocity (this is the only dimension in gig2 where the ranges can exactly be defined).
          dimension_channelaftertouch = 0x83, ///< Channel Key Pressure
          dimension_releasetrigger    = 0x84, ///< Special dimension for triggering samples on releasing a key.
          dimension_keyboard          = 0x85, ///< Dimension for keyswitching
          dimension_roundrobin        = 0x86, ///< Different samples triggered each time a note is played, dimension regions selected in sequence
          dimension_random            = 0x87, ///< Different samples triggered each time a note is played, random order
+         dimension_smartmidi         = 0x88, ///< For MIDI tools like legato and repetition mode
+         dimension_roundrobinkeyboard = 0x89, ///< Different samples triggered each time a note is played, any key advances the counter
          dimension_modwheel          = 0x01, ///< Modulation Wheel (MIDI Controller 1)
          dimension_breath            = 0x02, ///< Breath Controller (Coarse, MIDI Controller 2)
          dimension_foot              = 0x04, ///< Foot Pedal (Coarse, MIDI Controller 4)
-Line 258 
 namespace gig {
+Line 252 
 namespace gig {
       * into the corresponding dimension bit number.
       */
      typedef enum {
-         split_type_normal,         ///< dimension value between 0-127, no custom range of zones
+         split_type_normal,         ///< dimension value between 0-127
-         split_type_customvelocity, ///< a velocity dimension split with custom range definition for each zone (if a velocity dimension split has no custom defined zone ranges then it's also just of type split_type_normal)
          split_type_bit             ///< dimension values are already the sought bit number
      } split_type_t;
-Line 269 
 namespace gig {
+Line 262 
 namespace gig {
          uint8_t      bits;       ///< Number of "bits" (1 bit = 2 splits/zones, 2 bit = 4 splits/zones, 3 bit = 8 splits/zones,...).
          uint8_t      zones;      ///< Number of zones the dimension has.
          split_type_t split_type; ///< Intended for internal usage: will be used to convert a dimension value into the corresponding dimension bit number.
-         range_t*     ranges;     ///< Intended for internal usage: Points to the beginning of a range_t array which reflects the value ranges of each dimension zone (only if custom defined ranges are defined, is NULL otherwise).
+         float        zone_size;  ///< Intended for internal usage: reflects the size of each zone (128/zones) for normal split types only, 0 otherwise.
-         unsigned int zone_size;  ///< Intended for internal usage: reflects the size of each zone (128/zones) for normal split types only, 0 otherwise.
      };
      /** Defines which frequencies are filtered by the VCF. */
-Line 331 
 namespace gig {
+Line 323 
 namespace gig {
          progress_t();
      };
+     /** @brief CRC-32 checksum implementation
+      *
+      * This class is used to calculate checksums of the sample data in
+      * a gig file. The checksums are stored in the 3crc chunk of the
+      * gig file and automatically updated when a sample is written
+      * with Sample::Write().
+      */
+     class CRC {
+     private:
+         uint32_t value;
+         static const uint32_t* table;
+         static uint32_t* initTable();
+     public:
+         CRC() {
+             reset();
+         }
+         void reset() {
+             value = 0xffffffff;
+         }
+         void update(unsigned char* buf, int len) {
+             for (int i = 0 ; i < len ; i++) {
+                 value = table[(value ^ buf[i]) & 0xff] ^ (value >> 8);
+             }
+         }
+         uint32_t getValue() {
+             return value ^ 0xffffffff;
+         }
+     };
      // just symbol prototyping
      class File;
      class Instrument;
      class Sample;
      class Region;
+     class Group;
-     /** Encapsulates articulation information of a dimension region.
+     /** @brief Encapsulates articulation information of a dimension region.
       *
       *  Every Gigasampler Instrument has at least one dimension region
       *  (exactly then when it has no dimension defined).
-Line 351 
 namespace gig {
+Line 373 
 namespace gig {
       */
      class DimensionRegion : protected DLS::Sampler {
          public:
-             uint8_t            VelocityUpperLimit;            ///< Defines the upper velocity value limit of a velocity split (only if an user defined limit was set, thus a value not equal to 128/NumberOfSplits, else this value is 0).
+             uint8_t            VelocityUpperLimit;            ///< Defines the upper velocity value limit of a velocity split (only if an user defined limit was set, thus a value not equal to 128/NumberOfSplits, else this value is 0). Only for gig2, otherwise the DimensionUpperLimts are used instead.
              Sample*            pSample;                       ///< Points to the Sample which is assigned to the dimension region.
              // Sample Amplitude EG/LFO
              uint16_t           EG1PreAttack;                  ///< Preattack value of the sample amplitude EG (0 - 1000 permille).
-Line 435 
 namespace gig {
+Line 457 
 namespace gig {
              bool               MSDecode;                      ///< Gigastudio flag: defines if Mid Side Recordings should be decoded.
              uint16_t           SampleStartOffset;             ///< Number of samples the sample start should be moved (0 - 2000).
              double             SampleAttenuation;             ///< Sample volume (calculated from DLS::Sampler::Gain)
+             uint8_t            DimensionUpperLimits[8];       ///< gig3: defines the upper limit of the dimension values for this dimension region
              // derived attributes from DLS::Sampler
              DLS::Sampler::UnityNote;
-Line 443 
 namespace gig {
+Line 466 
 namespace gig {
              DLS::Sampler::SampleLoops;
              DLS::Sampler::pSampleLoops;
-             // Methods
+             // own methods
              double GetVelocityAttenuation(uint8_t MIDIKeyVelocity);
              double GetVelocityRelease(uint8_t MIDIKeyVelocity);
              double GetVelocityCutoff(uint8_t MIDIKeyVelocity);
+             Region* GetParent() const;
+             // derived methods
+             DLS::Sampler::AddSampleLoop;
+             DLS::Sampler::DeleteSampleLoop;
+             // overridden methods
+             virtual void UpdateChunks();
          protected:
-             DimensionRegion(RIFF::List* _3ewl);
+             uint8_t* VelocityTable; ///< For velocity dimensions with custom defined zone ranges only: used for fast converting from velocity MIDI value to dimension bit number.
+             DimensionRegion(Region* pParent, RIFF::List* _3ewl);
+             DimensionRegion(RIFF::List* _3ewl, const DimensionRegion& src);
             ~DimensionRegion();
              friend class Region;
          private:
-Line 488 
 namespace gig {
+Line 518 
 namespace gig {
              double*                  pVelocityAttenuationTable;  ///< Points to the velocity table corresponding to the velocity parameters of this DimensionRegion.
              double*                  pVelocityReleaseTable;      ///< Points to the velocity table corresponding to the release velocity parameters of this DimensionRegion
              double*                  pVelocityCutoffTable;       ///< Points to the velocity table corresponding to the filter velocity parameters of this DimensionRegion
+             Region*                  pRegion;
              leverage_ctrl_t DecodeLeverageController(_lev_ctrl_t EncodedController);
+             _lev_ctrl_t     EncodeLeverageController(leverage_ctrl_t DecodedController);
              double* GetVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling);
              double* CreateVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling);
      };
-     /** Encapsulates sample waves used for playback. */
+     /** @brief Encapsulates sample waves used for playback.
+      *
+      * In case you created a new sample with File::AddSample(), you should
+      * first update all attributes with the desired meta informations
+      * (amount of channels, bit depth, sample rate, etc.), then call
+      * Resize() with the desired sample size, followed by File::Save(), this
+      * will create the mandatory RIFF chunk which will hold the sample wave
+      * data and / or resize the file so you will be able to Write() the
+      * sample data directly to disk.
+      *
+      * @e Caution: for gig synthesis, most looping relevant information are
+      * retrieved from the respective DimensionRegon instead from the Sample
+      * itself. This was made for allowing different loop definitions for the
+      * same sample under different conditions.
+      */
      class Sample : public DLS::Sample {
          public:
-             uint16_t       SampleGroup;
              uint32_t       Manufacturer;      ///< Specifies the MIDI Manufacturer's Association (MMA) Manufacturer code for the sampler intended to receive this file's waveform. If no particular manufacturer is to be specified, a value of 0 should be used.
              uint32_t       Product;           ///< Specifies the MIDI model ID defined by the manufacturer corresponding to the Manufacturer field. If no particular manufacturer's product is to be specified, a value of 0 should be used.
-             uint32_t       SamplePeriod;      ///< Specifies the duration of time that passes during the playback of one sample in nanoseconds (normally equal to 1 / Samplers Per Second, where Samples Per Second is the value found in the format chunk).
+             uint32_t       SamplePeriod;      ///< Specifies the duration of time that passes during the playback of one sample in nanoseconds (normally equal to 1 / Samples Per Second, where Samples Per Second is the value found in the format chunk), don't bother to update this attribute, it won't be saved.
              uint32_t       MIDIUnityNote;     ///< Specifies the musical note at which the sample will be played at it's original sample rate.
              uint32_t       FineTune;          ///< Specifies the fraction of a semitone up from the specified MIDI unity note field. A value of 0x80000000 means 1/2 semitone (50 cents) and a value of 0x00000000 means no fine tuning between semitones.
              smpte_format_t SMPTEFormat;       ///< Specifies the Society of Motion Pictures and Television E time format used in the following <i>SMPTEOffset</i> field. If a value of 0 is set, <i>SMPTEOffset</i> should also be set to 0.
              uint32_t       SMPTEOffset;       ///< The SMPTE Offset value specifies the time offset to be used for the synchronization / calibration to the first sample in the waveform. This value uses a format of 0xhhmmssff where hh is a signed value that specifies the number of hours (-23 to 23), mm is an unsigned value that specifies the number of minutes (0 to 59), ss is an unsigned value that specifies the number of seconds (0 to 59) and ff is an unsigned value that specifies the number of frames (0 to -1).
-             uint32_t       Loops;             ///< Number of defined sample loops (so far only seen single loops in gig files - please report me if you encounter more!).
+             uint32_t       Loops;             ///< @e Caution: Use the respective field in the DimensionRegion instead of this one! (Intended purpose: Number of defined sample loops. So far only seen single loops in gig files - please report if you encounter more!)
              uint32_t       LoopID;            ///< Specifies the unique ID that corresponds to one of the defined cue points in the cue point list (only if Loops > 0), as the Gigasampler format only allows one loop definition at the moment, this attribute isn't really useful for anything.
-             loop_type_t    LoopType;          ///< The type field defines how the waveform samples will be looped (only if Loops > 0).
+             loop_type_t    LoopType;          ///< @e Caution: Use the respective field in the DimensionRegion instead of this one! (Intended purpose: The type field defines how the waveform samples will be looped.)
-             uint32_t       LoopStart;         ///< The start value specifies the offset (in sample points) in the waveform data of the first sample to be played in the loop (only if Loops > 0).
+             uint32_t       LoopStart;         ///< @e Caution: Use the respective field in the DimensionRegion instead of this one! (Intended purpose: The start value specifies the offset [in sample points] in the waveform data of the first sample to be played in the loop [only if Loops > 0].)
-             uint32_t       LoopEnd;           ///< The end value specifies the offset (in sample points) in the waveform data which represents the end of the loop (only if Loops > 0).
+             uint32_t       LoopEnd;           ///< @e Caution: Use the respective field in the DimensionRegion instead of this one! (Intended purpose: The end value specifies the offset [in sample points] in the waveform data which represents the end of the loop [only if Loops > 0].)
-             uint32_t       LoopSize;          ///< Length of the looping area (in sample points) which is equivalent to <i>LoopEnd - LoopStart</i>.
+             uint32_t       LoopSize;          ///< @e Caution: Use the respective fields in the DimensionRegion instead of this one! (Intended purpose: Length of the looping area [in sample points] which is equivalent to @code LoopEnd - LoopStart @endcode.)
-             uint32_t       LoopFraction;      ///< The fractional value specifies a fraction of a sample at which to loop (only if Loops > 0). This allows a loop to be fine tuned at a resolution greater than one sample. A value of 0 means no fraction, a value of 0x80000000 means 1/2 of a sample length. 0xFFFFFFFF is the smallest fraction of a sample that can be represented.
+             uint32_t       LoopFraction;      ///< The fractional value specifies a fraction of a sample at which to loop. This allows a loop to be fine tuned at a resolution greater than one sample. A value of 0 means no fraction, a value of 0x80000000 means 1/2 of a sample length. 0xFFFFFFFF is the smallest fraction of a sample that can be represented.
-             uint32_t       LoopPlayCount;     ///< Number of times the loop should be played (only if Loops > 0, a value of 0 = infinite).
+             uint32_t       LoopPlayCount;     ///< Number of times the loop should be played (a value of 0 = infinite).
              bool           Compressed;        ///< If the sample wave is compressed (probably just interesting for instrument and sample editors, as this library already handles the decompression in it's sample access methods anyway).
              uint32_t       TruncatedBits;     ///< For 24-bit compressed samples only: number of bits truncated during compression (0, 4 or 6)
              bool           Dithered;          ///< For 24-bit compressed samples only: if dithering was used during compression with bit reduction
-Line 528 
 namespace gig {
+Line 573 
 namespace gig {
              static void     DestroyDecompressionBuffer(buffer_t& DecompressionBuffer);
              // overridden methods
              void          ReleaseSampleData();
+             void          Resize(int iNewSize);
              unsigned long SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence = RIFF::stream_start);
              unsigned long GetPos();
              unsigned long Read(void* pBuffer, unsigned long SampleCount, buffer_t* pExternalDecompressionBuffer = NULL);
-             unsigned long ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState, buffer_t* pExternalDecompressionBuffer = NULL);
+             unsigned long ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState, DimensionRegion* pDimRgn, buffer_t* pExternalDecompressionBuffer = NULL);
+             unsigned long Write(void* pBuffer, unsigned long SampleCount);
+             Group*        GetGroup() const;
+             virtual void  UpdateChunks();
          protected:
              static unsigned int  Instances;               ///< Number of instances of class Sample.
              static buffer_t      InternalDecompressionBuffer; ///< Buffer used for decompression as well as for truncation of 24 Bit -> 16 Bit samples.
+             Group*               pGroup;                  ///< pointer to the Group this sample belongs to (always not-NULL)
              unsigned long        FrameOffset;             ///< Current offset (sample points) in current sample frame (for decompression only).
              unsigned long*       FrameTable;              ///< For positioning within compressed samples only: stores the offset values for each frame.
              unsigned long        SamplePos;               ///< For compressed samples only: stores the current position (in sample points).
-Line 543 
 namespace gig {
+Line 593 
 namespace gig {
              unsigned long        SamplesPerFrame;         ///< For compressed samples only: number of samples in a full sample frame.
              buffer_t             RAMCache;                ///< Buffers samples (already uncompressed) in RAM.
              unsigned long        FileNo;                  ///< File number (> 0 when sample is stored in an extension file, 0 when it's in the gig)
+             RIFF::Chunk*         pCk3gix;
+             RIFF::Chunk*         pCkSmpl;
+             CRC                  crc;                     ///< CRC-32 checksum of the raw sample data
              Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset, unsigned long fileNo = 0);
             ~Sample();
-             /**
-              * Swaps the order of the data words in the given memory area
-              * with a granularity given by \a WordSize.
-              *
-              * @param pData    - pointer to the memory area to be swapped
-              * @param AreaSize - size of the memory area to be swapped (in bytes)
-              * @param WordSize - size of the data words (in bytes)
-              */
-             inline void SwapMemoryArea(void* pData, unsigned long AreaSize, uint WordSize) {
-                 switch (WordSize) { // TODO: unefficient
-                     case 1: {
-                         uint8_t* pDst = (uint8_t*) pData;
-                         uint8_t  cache;
-                         unsigned long lo = 0, hi = AreaSize - 1;
-                         for (; lo < hi; hi--, lo++) {
-                             cache    = pDst[lo];
-                             pDst[lo] = pDst[hi];
-                             pDst[hi] = cache;
-                         }
-                         break;
-                     }
-                     case 2: {
-                         uint16_t* pDst = (uint16_t*) pData;
-                         uint16_t  cache;
-                         unsigned long lo = 0, hi = (AreaSize >> 1) - 1;
-                         for (; lo < hi; hi--, lo++) {
-                             cache    = pDst[lo];
-                             pDst[lo] = pDst[hi];
-                             pDst[hi] = cache;
-                         }
-                         break;
-                     }
-                     case 4: {
-                         uint32_t* pDst = (uint32_t*) pData;
-                         uint32_t  cache;
-                         unsigned long lo = 0, hi = (AreaSize >> 2) - 1;
-                         for (; lo < hi; hi--, lo++) {
-                             cache    = pDst[lo];
-                             pDst[lo] = pDst[hi];
-                             pDst[hi] = cache;
-                         }
-                         break;
-                     }
-                     default: {
-                         uint8_t* pCache = new uint8_t[WordSize]; // TODO: unefficient
-                         unsigned long lo = 0, hi = AreaSize - WordSize;
-                         for (; lo < hi; hi -= WordSize, lo += WordSize) {
-                             memcpy(pCache, (uint8_t*) pData + lo, WordSize);
-                             memcpy((uint8_t*) pData + lo, (uint8_t*) pData + hi, WordSize);
-                             memcpy((uint8_t*) pData + hi, pCache, WordSize);
-                         }
-                         delete[] pCache;
-                         break;
-                     }
-                 }
-             }
-             inline long Min(long A, long B) {
-                 return (A > B) ? B : A;
-             }
-             inline long Abs(long val) { return (val > 0) ? val : -val; }
              // Guess size (in bytes) of a compressed sample
              inline unsigned long GuessSize(unsigned long samples) {
-Line 632 
 namespace gig {
+Line 625 
 namespace gig {
              void ScanCompressedSample();
              friend class File;
              friend class Region;
+             friend class Group; // allow to modify protected member pGroup
      };
      // TODO: <3dnl> list not used yet - not important though (just contains optional descriptions for the dimensions)
      /** Defines <i>Region</i> information of an <i>Instrument</i>. */
      class Region : public DLS::Region {
          public:
-             unsigned int            Dimensions;               ///< Number of defined dimensions.
+             unsigned int            Dimensions;               ///< Number of defined dimensions, do not alter!
-             dimension_def_t         pDimensionDefinitions[8]; ///< Defines the five (gig2) or eight (gig3) possible dimensions (the dimension's controller and number of bits/splits).
+             dimension_def_t         pDimensionDefinitions[8]; ///< Defines the five (gig2) or eight (gig3) possible dimensions (the dimension's controller and number of bits/splits). Use AddDimension() and DeleteDimension() to create a new dimension or delete an existing one.
-             uint32_t                DimensionRegions;         ///< Total number of DimensionRegions this Region contains.
+             uint32_t                DimensionRegions;         ///< Total number of DimensionRegions this Region contains, do not alter!
-             DimensionRegion*        pDimensionRegions[256];   ///< Pointer array to the 32 (gig2) or 256 (gig3) possible dimension regions (reflects NULL for dimension regions not in use). Avoid to access the array directly and better use GetDimensionRegionByValue() instead, but of course in some cases it makes sense to use the array (e.g. iterating through all DimensionRegions).
+             DimensionRegion*        pDimensionRegions[256];   ///< Pointer array to the 32 (gig2) or 256 (gig3) possible dimension regions (reflects NULL for dimension regions not in use). Avoid to access the array directly and better use GetDimensionRegionByValue() instead, but of course in some cases it makes sense to use the array (e.g. iterating through all DimensionRegions). Use AddDimension() and DeleteDimension() to create a new dimension or delete an existing one (which will create or delete the respective dimension region(s) automatically).
-             unsigned int            Layers;                   ///< Amount of defined layers (1 - 32). A value of 1 actually means no layering, a value > 1 means there is Layer dimension. The same information can of course also be obtained by accessing pDimensionDefinitions.
+             unsigned int            Layers;                   ///< Amount of defined layers (1 - 32). A value of 1 actually means no layering, a value > 1 means there is Layer dimension. The same information can of course also be obtained by accessing pDimensionDefinitions. Do not alter this value!
+             // own methods
              DimensionRegion* GetDimensionRegionByValue(const uint DimValues[8]);
              DimensionRegion* GetDimensionRegionByBit(const uint8_t DimBits[8]);
              Sample*          GetSample();
+             void             AddDimension(dimension_def_t* pDimDef);
+             void             DeleteDimension(dimension_def_t* pDimDef);
+             // overridden methods
+             virtual void     SetKeyRange(uint16_t Low, uint16_t High);
+             virtual void     UpdateChunks();
          protected:
-             uint8_t VelocityTable[128]; ///< For velocity dimensions with custom defined zone ranges only: used for fast converting from velocity MIDI value to dimension bit number.
              Region(Instrument* pInstrument, RIFF::List* rgnList);
              void LoadDimensionRegions(RIFF::List* rgn);
+             void UpdateVelocityTable();
              Sample* GetSampleFromWavePool(unsigned int WavePoolTableIndex, progress_t* pProgress = NULL);
             ~Region();
              friend class Instrument;
-Line 684 
 namespace gig {
+Line 683 
 namespace gig {
              // overridden methods
              Region*   GetFirstRegion();
              Region*   GetNextRegion();
+             Region*   AddRegion();
+             void      DeleteRegion(Region* pRegion);
+             virtual void UpdateChunks();
              // own methods
              Region*   GetRegion(unsigned int Key);
          protected:
-             Region**  pRegions;            ///< Pointer array to the regions
              Region*   RegionKeyTable[128]; ///< fast lookup for the corresponding Region of a MIDI key
-             int       RegionIndex;
              Instrument(File* pFile, RIFF::List* insList, progress_t* pProgress = NULL);
             ~Instrument();
+             void UpdateRegionKeyTable();
+             friend class File;
+             friend class Region; // so Region can call UpdateRegionKeyTable()
+     };
+     /** @brief Group of Gigasampler objects
+      *
+      * Groups help to organize a huge collection of Gigasampler objects.
+      * Groups are not concerned at all for the synthesis, but they help
+      * sound library developers when working on complex instruments with an
+      * instrument editor (as long as that instrument editor supports it ;-).
+      *
+      * At the moment, it seems as only samples can be grouped together in
+      * the Gigasampler format yet. If this is false in the meantime, please
+      * tell us !
+      *
+      * A sample is always assigned to exactly one Group. This also means
+      * there is always at least one Group in a .gig file, no matter if you
+      * created one yet or not.
+      */
+     class Group {
+         public:
+             String Name; ///< Stores the name of this Group.
+             Sample* GetFirstSample();
+             Sample* GetNextSample();
+             void AddSample(Sample* pSample);
+         protected:
+             Group(File* file, RIFF::Chunk* ck3gnm);
+             virtual ~Group();
+             virtual void UpdateChunks();
+             void MoveAll();
              friend class File;
+         private:
+             File*        pFile;
+             RIFF::Chunk* pNameChunk;
      };
-     // TODO: <3gnm> chunk not added yet (just contains the names of the sample groups)
      /** Parses Gigasampler files and provides abstract access to the data. */
      class File : protected DLS::File {
          public:
+             static const DLS::version_t VERSION_2;
+             static const DLS::version_t VERSION_3;
              // derived attributes from DLS::Resource
              DLS::Resource::pInfo;
              DLS::Resource::pDLSID;
-Line 709 
 namespace gig {
+Line 746 
 namespace gig {
              // derived methods from DLS::Resource
              DLS::Resource::GetParent;
+             // derived methods from DLS::File
+             DLS::File::Save;
              // overridden  methods
+             File();
              File(RIFF::File* pRIFF);
              Sample*     GetFirstSample(progress_t* pProgress = NULL); ///< Returns a pointer to the first <i>Sample</i> object of the file, <i>NULL</i> otherwise.
              Sample*     GetNextSample();      ///< Returns a pointer to the next <i>Sample</i> object of the file, <i>NULL</i> otherwise.
+             Sample*     AddSample();
+             void        DeleteSample(Sample* pSample);
              Instrument* GetFirstInstrument(); ///< Returns a pointer to the first <i>Instrument</i> object of the file, <i>NULL</i> otherwise.
              Instrument* GetNextInstrument();  ///< Returns a pointer to the next <i>Instrument</i> object of the file, <i>NULL</i> otherwise.
              Instrument* GetInstrument(uint index, progress_t* pProgress = NULL);
-            ~File();
+             Instrument* AddInstrument();
+             void        DeleteInstrument(Instrument* pInstrument);
+             Group*      GetFirstGroup(); ///< Returns a pointer to the first <i>Group</i> object of the file, <i>NULL</i> otherwise.
+             Group*      GetNextGroup();  ///< Returns a pointer to the next <i>Group</i> object of the file, <i>NULL</i> otherwise.
+             Group*      GetGroup(uint index);
+             Group*      AddGroup();
+             void        DeleteGroup(Group* pGroup);
+             void        DeleteGroupOnly(Group* pGroup);
+             virtual    ~File();
+             virtual void UpdateChunks();
          protected:
-             typedef std::list<Sample*>     SampleList;
+             // overridden protected methods from DLS::File
-             typedef std::list<Instrument*> InstrumentList;
+             virtual void LoadSamples();
+             virtual void LoadInstruments();
-             SampleList*              pSamples;
+             virtual void LoadGroups();
-             SampleList::iterator     SamplesIterator;
+             // own protected methods
-             InstrumentList*          pInstruments;
+             virtual void LoadSamples(progress_t* pProgress);
-             InstrumentList::iterator InstrumentsIterator;
+             virtual void LoadInstruments(progress_t* pProgress);
+             void SetSampleChecksum(Sample* pSample, uint32_t crc);
-             void LoadSamples(progress_t* pProgress = NULL);
-             void LoadInstruments(progress_t* pProgress = NULL);
              friend class Region;
+             friend class Sample;
-             std::list<RIFF::File*> ExtensionFiles;
+             friend class Group; // so Group can access protected member pRIFF
+         private:
+             static const DLS::Info::FixedStringLength FixedStringLengths[];
+             std::list<Group*>*          pGroups;
+             std::list<Group*>::iterator GroupsIterator;
      };
-     /** Will be thrown whenever a gig specific error occurs while trying to access a Gigasampler File. */
+     /**
+      * Will be thrown whenever a gig specific error occurs while trying to
+      * access a Gigasampler File. Note: In your application you should
+      * better catch for RIFF::Exception rather than this one, except you
+      * explicitly want to catch and handle gig::Exception, DLS::Exception
+      * and RIFF::Exception independently, which usually shouldn't be
+      * necessary though.
+      */
      class Exception : public DLS::Exception {
          public:
              Exception(String Message);

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